Has Kim Jong-un finally grown up?

Given the mutual bluster, threats and sabre-rattling we got used to from Donald Trump and Kim Jong-un, it may be hard to credit the air of sweet reasonableness that has spread over the Korean peninsula in recent weeks leading to the weekend announcement of an end to weapons testing by the North. The potential for a reversion to confrontation is all too evident. Pyongyang has a long record of reneging on agreements and its announcement contained no mention of a reduction in its arsenal that includes missiles which can hit Japan and South Korea even if it stops development of ICBMs aimed at the USA. But, for the moment at least, this seems a moment when the different interests of the main players have been brought into alignment, not only Trump and the two Koreas but also the big beast in the region – China.